:root {
    /* Color Palette - Premium Minimalist */
    --primary-color: #2563eb; /* Royal Blue */
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b; /* Slate */
    --success-color: #10b981; /* Emerald */
    --danger-color: #ef4444; /* Red */
    --warning-color: #f59e0b; /* Amber */
    --info-color: #3b82f6; /* Blue */
    
    --bg-body: #f8fafc; /* Very light slate */
    --bg-surface: #ffffff;
    --bg-surface-hover: #f1f5f9;
    
    --text-primary: #1e293b; /* Slate 800 */
    --text-secondary: #64748b; /* Slate 500 */
    --text-muted: #94a3b8; /* Slate 400 */
    
    --border-color: #e2e8f0; /* Slate 200 */
    --border-focus: #bfdbfe;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-body);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    line-height: 1.5;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.025em;
    color: var(--text-primary);
}

.text-secondary {
    color: var(--text-secondary) !important;
}

/* Layout & Containers */
.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
}

/* Cards */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    background: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

/* Buttons */
.btn {
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
}

.btn-outline-secondary {
    color: var(--text-secondary);
    border-color: var(--border-color);
    background: transparent;
}

.btn-outline-secondary:hover {
    background-color: var(--bg-surface-hover);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

.btn-icon {
    padding: 0.5rem;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    background: transparent;
    border: none;
}

.btn-icon:hover {
    background-color: var(--bg-surface-hover);
    color: var(--primary-color);
}

/* Forms */
.form-control, .form-select {
    border-color: var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.625rem 0.875rem;
    font-size: 0.925rem;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    outline: none;
}

/* Tables */
.table-custom {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.table-custom th {
    background-color: var(--bg-surface-hover);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.75rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
}

.table-custom td {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    vertical-align: middle;
}

.table-custom tr:last-child td {
    border-bottom: none;
}

.table-custom tr:hover td {
    background-color: var(--bg-surface-hover);
}

/* Badges */
.badge {
    padding: 0.35em 0.65em;
    font-size: 0.75em;
    font-weight: 600;
    border-radius: var(--radius-sm);
}

.badge-success {
    background-color: #dcfce7;
    color: #166534;
}

.badge-warning {
    background-color: #fef3c7;
    color: #92400e;
}

.badge-danger {
    background-color: #fee2e2;
    color: #991b1b;
}

.badge-info {
    background-color: #dbeafe;
    color: #1e40af;
}

/* Navbar */
.navbar-custom {
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: all 0.2s;
    text-decoration: none;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-color);
    background-color: #eff6ff;
}

.navbar-brand {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.25rem;
    text-decoration: none;
}

/* Utilities */
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }
.gap-4 { gap: 1.5rem; }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }

.rounded-lg { border-radius: var(--radius-lg); }

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.3s ease-out forwards;
}